Security consultant Aldo Cortesi said in a blog post (via ZDNet) that it took him less than a day to exploit the goto fail bug in OS X to capture all SSL traffic, and that there’s a good chance he isn’t the first to have done so – an implicit suggestion that the vulnerability may already be being used in man-in-the-middle attacks.

I’ve confirmed full transparent interception of HTTPS traffic on both IOS (prior to 7.0.6) and OSX Mavericks. Nearly all encrypted traffic, including usernames, passwords, and even Apple app updates can be captured. This includes:

App store and software update traffic

iCloud data, including KeyChain enrollment and updates

Data from the Calendar and Reminders

Find My Mac updates

Traffic for applications that use certificate pinning, like Twitter … expand full story